New Coachman, Water Pump Issues - Updated/Fixed

Ralph Cramden wrote:
You should not have to prime an RV water pump, they're self priming.

The city water connection has nothing to do with it, as its tied in past the pump.

If the city water inlet check valve isn't sealing properly the water pump can have a difficult time priming & developing sufficient pressure so yes, even a self priming pump will have difficulty priming if there's a leak in the system.